CCNP MPLS and VPN Technologies 2

Question 1

What is a Route Target (RT) used for in MPLS L3VPN?

Accepted Answer

To control which VRFs import and export routes between PE routers

Answer

To assign MPLS labels to VPN prefixes in the LFIB

Answer

To define the BGP AS path for VPN routes

Answer

To set the QoS DSCP value on VPN-labeled packets

Question 2

In MPLS TE, which protocol is used to signal and establish label-switched paths (LSPs)?

Accepted Answer

RSVP-TE

Answer

LDP

Answer

BGP with TE extensions

Answer

OSPF-TE

Question 3

What is the role of CSPF (Constrained Shortest Path First) in MPLS Traffic Engineering?

Accepted Answer

It computes an explicit path for a TE tunnel that satisfies bandwidth and constraint requirements

Answer

It replaces IS-IS/OSPF as the IGP for TE-enabled networks

Answer

It balances traffic across equal-cost multipaths in the LFIB

Answer

It redistributes TE tunnel metrics into the BGP table

Question 4

Which MPLS VPN model allows two VPNs to share specific routes, such as a shared services VPN?

Accepted Answer

Extranet VPN using overlapping RTs

Answer

Hub-and-spoke VPN

Answer

Full-mesh VPN with unique RDs

Answer

VPLS with H-VPLS hierarchy

Question 5

What does the 'ip vrf forwarding' command do when applied to a router interface?

Accepted Answer

Associates the interface with a specific VRF, removing it from the global routing table

Answer

Enables MPLS label imposition on the interface

Answer

Activates LDP neighbor discovery on the interface

Answer

Configures the interface as a VPN inter-AS link

Question 6

In MPLS L3VPN Option B inter-AS connectivity, what is exchanged between the ASBR routers?

Accepted Answer

Labeled VPNv4 routes with next-hop changed to the ASBR's own address

Answer

VPNv4 routes with original next-hop preserved via BGP next-hop unchanged

Answer

Unlabeled IPv4 prefixes redistributed into the remote AS IGP

Answer

GRE tunnels carrying full VRF routing tables between ASBRs

Question 7

Which command on a Cisco PE router verifies that a VRF has the correct Route Distinguisher and Route Targets configured?

Accepted Answer

show vrf detail

Answer

show ip bgp vpnv4 all

Answer

show mpls ldp neighbor detail

Answer

show ip vrf interfaces